v4.0.1

• Fix: in IE8 3rd image not always appended.
• Minified assets (images, svg).
• Improved keyboard events handling. Esc key handler moved to keydown. Keyup listener removed entirely. Added e.preventDefault() to keyboard events.
• Fix: commonjs/browserify issue.
• Improved Sass files, added Autoprefixer, path to assets can be configurable.
• Fix: in old Android (<4.4) tap event could trigger twice.

More info in commit history.